Meniscus

n. lens that is convex on one side and concave on the other (Optics); crescent or crescent-shaped body; disk of cartilage that cushions between the ends of two bones (Anatomy); curvature of the upper surface of liquid which is caused by surface tension

For other uses, see: meniscus (anatomy) and lens (optics). Meniscus, plural: menisci, from the Greek for "crescent", is a curve in the surface of a liquid and is produced in response to the surface of the container or another object. It can be either concave or convex. A convex meniscus occurs when the molecules of the liquid repel the molecules of the container or object. This may be seen between mercury and glass in barometers. Conversely, a concave meniscus occurs when the molecules of the liquid attract those of the container. This can be seen between water and glass.  Surface tension acts on concave menisci to pull the liquid up, and on convex menisci to pull the liquid down. This phenomenon is important in transpirational pull in plants.
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Meniscus /me·nis·cus/ pl. menis´ci [L.] something of crescent shape, as the concave or convex surface of a column of liquid in a pipet or buret, [more]Meniscus - Community and Resources

Noun
1. a disk of cartilage that serves as a cushion between the ends of bones that meet at a point
(hypernym) cartilage, gristle

n. meniscus